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The American historian Dr Jennifer Keene, from Chapman University in California, discusses the importance to Americans of the sinking by a German torpedo of the cruise ship RMS Lusitania, 1915. It was an act that contributed to the US joining World War One, its first war on European soil. (Photo: 7th May 1915, The sinking of the Cunard ocean liner 'Lusitania' by a German submarine off the Old Head of Kinsale, Ireland.) (Credit: Three Lions/Getty Images)
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